Symmetrical world
Why a hedge binds around the tree always in one direction? Why mollusks and DNA chain are right-handed but aminoacids
left-handed?
In Physics, all processes are symmetric, if we look from right or left. Or better: almost all processes!
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Electromagnetic interaction is symmetric over charge sign. p
meson can decay only into two photons (with parity -1 each), never into three photons.
What is asymmetric is the weakest (apart from the gravity) elementary interaction, that of beta and mesons K decay. The reason? The lightest, but probably no mass-less particle, always left handed, called neutrino.